连接弱交流系统的高压直流换流站无功补偿协调控制策略

发布时间：2018-05-03 16:04

本文选题：直流输电 + 弱交流系统　；参考：《电力系统自动化》2017年08期

【摘要】：在馈入端交流系统强度较弱、直流传输功率频繁波动的高压直流系统中,换流站无功补偿设备的协调控制对改善换流母线电压的稳定性具有重要意义。提出了一种基于静态同步补偿器(STATCOM)和电容器组相互协调的多模式协调控制策略,主要包括换流母线电压无静差跟踪额定电压的稳态调压模式、换流站参与近区交流系统电压调节的自动电压控制(AVC)模式,以及换流母线发生短路故障时抑制电压波动与换相失败的暂态控制模式。基于实际工程参数,在电磁暂态仿真软件(PSCAD)建立了±800kV酒泉—湖南特高压直流输电系统仿真模型,并在直流功率波动、AVC中心下发指令电压和馈入交流系统短路故障等多种工况下对该多模式控制策略的性能进行了仿真验证。仿真结果论证了所提出的换流站无功补偿设备协调控制策略的合理性和有效性。
[Abstract]:In the HVDC system with weak input AC system and frequent fluctuation of DC transmission power, the coordinated control of reactive power compensation equipment in converter station is of great significance to improve the stability of commutation bus voltage. A multi-mode coordinated control strategy based on the mutual coordination between static synchronous compensator (STATCOM) and capacitor banks is proposed, which mainly includes the steady-state voltage regulation mode of commutation bus voltage without static error tracking rated voltage. The converter station participates in the automatic voltage control (AVC) mode of voltage regulation in the near area AC system, and the transient control mode in which voltage fluctuation is suppressed and commutation failure occurs when the commutation bus is short circuit fault. Based on the actual engineering parameters, the simulation model of 卤800kV Jiuquan-Hunan UHVDC transmission system is established in the electromagnetic transient simulation software (PSCAD). The performance of the multi-mode control strategy is simulated under a variety of operating conditions such as DC power fluctuation AVC center instruction voltage and short circuit fault of feed in AC system. The simulation results demonstrate the rationality and effectiveness of the proposed coordinated control strategy for reactive power compensation equipment in converter station.
【作者单位】：国家电能变换与控制工程研究中心(湖南大学);国网湖南省电力公司电力科学研究院;
【基金】：国家自然科学基金资助项目(51477044) 国家电网公司科技项目(5216A015001S)~~
【分类号】：TM721.1;TM714.3

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